Rainfall and Tillage Impacts on Soil Erosion of Sloping Cropland with Subtropical Monsoon Climate- A Case Study in Hilly Purple Soil area, China  

作　　者：TANG Jia-liang CHENG Xun-qiang ZHU Bo GAO Mei-rong WANG Tao ZHANG Xi-feng ZHAO Pei YOU Xiang 

机构地区：[1]Key Laboratory of Mountain Environment Evolution and Regulation, Institute of Mountain Hazards and Environment,Chinese Academy of Sciences [2]Provincial Monitoring Station of Soil and Water Conservation

出　　处：《Journal of Mountain Science》2015年第1期134-144,共11页山地科学学报（英文）

基　　金：support of this study was provided by the National Natural Science Foundation of China (Grant No. 41371241 and 41101202);the Western Development Plan of Chinese Academy of Sciences (Grant No. KZCX2XB3-09);the National Basic Research Program of the Ministry of Science and Technology of China (Grant No. 2012CB417101)

摘　　要：Under global warming, storm events tend to intensify, particularly in monsoon-affected regions. As an important agricultural area in China, the purple soil region in the Sichuan Basin, where it has a prevailing monsoon climate, is threatened by serious soil erosion. Tillage operations alter runoff and soil erosion processes on croplands by changing the physical properties of the soil surface. To clarify the relationship between tillage and soil erosion in the purple soil region, three different tillage practices in this region were investigated at the plot scale over 4 years： bare land with minimum tillage （BL）, conventional tillage （CT） and seasonal no-tillage ridges （SNTR） which was initially designed to prevent soil erosion by contoured ridges and no-tillage techniques. The results showed that although there were no significant differences in the surface runoff and soil erosion among the three oractices, BL caused relatively high surface runoff and soil erosion, followed by CT and SNTR. Classification and comparison of the rainfall events based on cluster analysis （CA） verified that the surface runoff was not significantly different between most intensive event and long intensive events but was significantly different between most intensive and short and medium-duration events. Only the rainfall events with the highest rainfall intensity could trigger serious soil erosion, up to 1000 kg ha^-1 in the region. Further detailed investigations on the effects of tillage operations on the soil erosion in a subtropical region with a monsoon climate are needed to provide a basis for modeling catchments and designing better management practices.

关 键 词：Soil erosion Purple soil Tillage types Rainfall intensity Cluster analysis. 

分 类 号：S157[农业科学—土壤学]